Rotary pump.



N9. 869,050. PATENTED OCT. 22. 907.

R. M. BLAGKMER.

ROTARY PUMP.

APPLICATION FILED .0OT.13 1905.

2 SHEETS SHEET 1- 7l ii7te/aaea, Zia-yaw,

No. 869,050. PATENTED OCT ZZJ 1907.

' R. M. BLACKMER.

ROTARY PUMP.

APPLICATION FILED OUT-13. 1905.

2 SHEETS-SHEET 2.

1 UNITED STATES PATENT OFFICE. Y

ROBERT M. BLAGKMER, OF CONWAY, MICHIGAN, .ASSIGNOR TO BLAOKMER ROTARY PUMP,

POWER AND MANUFACTURING COMPANY, OF PETOSKEY, MICHIGAN, A CORPORATION or MICHIGAN.

' ROTARY PUMP.

. To all whom it may concern:

Be it known that I, ROBERT M. BLACKMER, a citizen of the United States, residing at Conway, in the county of Emmet and State of Michigan, have invented certain new and useful Improvements in Rotary Pumps, of which the following is a specification.

My invention relates to rotary pumps of the' type,

" said pump chamber; to a new and improved'form oi piston or bucket carrier designed to prevent interference with the movements of the buckets by the water and by foreign matter in the water; to improvements in theform of the bucket blade or scoop whereby the pressure of the water aids the centrifugal action in holding the working edge of the blade to the wall of the casing or chamber; and to other features that will hereinafter appear.

A pump embodying my improvements is illustrated in the accompanying drawings, wherein,

Figure 1 is a side elevation with; one side plate removed and with the driving shaft in section; Fig. 2 is a perspective view of the piston or bucket carrier; Fig.

3 is a perspective view of one of the buckets; and Fig,

4 is a view in the nature of a diagram intended to illustrate the geometrical relations 'of the several parts of the pump chamber.

Referring to the drawings for amore particular description of the parts, 5 indicates as an entirety the casing, within which is a chamber closed in between parallel side walls anda curved cylinder wall within which the chamber is formed as parts or sectors of four cylindrical chambers. This circular wall is tapped'on '10 and 11, respectively.

one side bythe'water inlet-port-G, the upperand lower boundaries of, which-at their junction with the inner curved wall ,of the casing are indicated at 7 and 8, re spectively; and-'9 designates the'outlet or dischargeport; the similar boundaries of which are indicated at v Referring vto Fig. fl,'i or an illustration of the form and design ofthe :pump chamber, A designates a center,-

from which, on a radius B, is struck an arc a'b, forming the upper portion of the curved wall of the casing.

C. is another center somewhat below and to one side of:

the center A, from which, on a radius D, is struckan Specification of Letters Patent.

Application filed October 18, 1905. Serial No. 282.617.

Patented Oct. 22, 1907.

arc bc. E is still another center, also located below I and slightly to the other side of the center A, from which, on a radius F, is struck an arc d-a. Arcs b-c and da are substantially equal in extent and of the same curvature, and form the side portions of the curved wall of the casing. From the center A, on a radius G, is struck the arc o-.-d that forms the lower part of the cur'yed wall of the casing. From the foregoing it will be seen that the space of the pump chamber is made up substantially of parts or sectors of four circles, two of which (the upper and lower (have a commoncenter at A, but radii of different lengths; while the other two have radii of equal or substantially equal lengths but have separate centers 0 and E, respectively. The piston chamber may, therefore, be properly referred to as a triple-centered chamber. It will be observed that the upper edge 7 of the inlet-port is somewhat below or in advance of the point I) of the cyl inder wall, and the lower, edge 8 ottheinlet-port is' likewise some distance below or in advance'of the point cot the cylinder wall. It will also be observed that on the discharge side the'upper edge 10 of the discharge-port is somewhat above or in advance of the point a. of the cylinder wall, while its lower edge 11 is somewhat below or behind the point (1 of the cylinder Wall. The terms in advanceof] and behind, as above used, have referenceto the direction of movement of the pistoh buckets.

Rotatably mounted in and transversely of the walls of the casing is a driven shaft 12, the axis of which 'coincides with the center A, Fast on this shaft, within the cylinder chamber, and in loose sliding contact with the sidewalls of the latter, is a piston or bucket-carrier,

designated as an entirety by 13. This bucket-carrier is circular in peripheral contour, having a radius equal to the radius B of the upper and smaller sector of the pump chamber, whereby the periphery of saidbucket carrier in passing over the 'arc ab iormsa sliding contact with the latter. The periphery of said bucketcarrier is cut away at intervals, forming pockets 14,

which pockets are formed at one end with a semi-circular seat 15 adapted to receive the rounded-fulcrumed end of a bucket, hereinafter referred to; there being also formed in the bucket-carrier a series of radial slots 16 that communicate with the opposite ends of the bucket pockets 14, respectively, and are curved on the arc of a circle struck from the" center of the seat 15, the slots 16, like'the pockets 14, extending from side to side of the bucketrcarrier. In each side of the bucket-carrier is iorm'ed an annulargroove 17 that is concentric with the axis of the carrier and communicates with the inner ends of the slots 16, so that the latter are in communication with each other through said annular grooves.

Thebuckets are each formed by a curved blade 18 of a form and size to slidingly fit the slots 16, a pair of arms 19 connected to the outer portion of said blade on either side, and a rounded bearing-member 20 connecting the, opposite ends of said arms and fitting the seat 15. The outer edge of each blade 18 that engages the inner curved walls of the pump cylinder is preferably beveled as shown at 21, so as to have a substantial line contact with the inner wall of the cylinder. Preferably, also, the back or convex side of the blade 18 is hollowed out or formed with one or more pockets 22, the purpose of which will appear in connection with the description of the operation.

In the operation'of the pump the shaft 12 is rotated at a high speed in clockwise direction as shown in Fig. 1, which causes the free ends of the buckets to be thrown outwardly under centrifugal force, aided by gravity through the lower half of the chamber, into'contact with the rounded walls of the latter, the first effect be ing to exhaust the air contained in the chamber, after which the water enters under "atmospheric pressure 7 and primes the pump. Thereupo'n, as-soon as the outer as it passes the point 8, it takeaits full load and carries it on under substantially constant pressure to the lower edge 11 of the orifice of the discharge-port! As it sweeps over the extended area of the orifice of the dis-' charge-port, the bucket is gradually forced back into its seat in the piston, the gradually contracting space by the line cd (Fig 4).

bounded by the face of the latter, the bucket-blade and the plane of the orifice of said discharge-port serving to force the water out through the latter. By the time" the blade has reached the point a, it is fully retracted within its seat; and therefore the bucket travelsthrough the arc ab, in fully retracted position, and with a small dy of confined or dead water which is carried around bodily between the upper edge 10 of the discharge-port orifice and the point b of the wall of the pump, forming a water packing. i

It will be observed that both ports of the pump casing extend to some distance within the lower sector of maximum radius of curvature, the arc of which is measured The object of this is that the bucket may be atits full or maximum throw, before receiving and delivering its full load. As fast as each bucket passes over the discharge port, the full pressure is gradually thrown upon and received by the next following bucket, thus enabling the advance bucket to be readily forced to its seat as it approaches the upper and smaller arc of the casing. The purpose of extending the upper edge 10 of the discharge-port a short distance into the bucket-retracted arc ab is to permit a limited continued discharge of the water after the bucket has entered upon the travel of said are, which prevents the water from pocketing or jamming.

The form of bucket as shown in the drawings is such that the inner part. of the/blade 18 is at all times in the slot or recess 16," never entirely leaving the latter. This prevents any hard or foreign substance that may be contained in the liquid from getting jammed between the blade of the bucket and its run-way and preventing the bucket fromclosing freely. The yoke-shaped form" .of the bucket allows the water to readily pass between the arms thereof into and out of the bucket seat as the bucket opens and closes, so that at all times there is a substantially equal fluid pressure on all parts of the bucket blade. The. groove 17 connecting the inner ends of the slots or run-ways 16 constitutes a circular bypass for the water so that as one blade returns into its guide slot, it forces the water out of the latter through the by-p'ass 17 and into the guide-slots of the other blades which are movingoutwardly, thus assisting the outward throw of the latter. The portion (are 10 b) of the inner wall of the casing which" is always in 0011- tact with the periphery of the piston or bucket-carrier is of greater length than the length over all of each bucket pocket, so that the openings in the piston formed by said pockets are fully covered between the discharge, and inlet ports, and there is no opportunity for the water to pass from the former to the latter. The pump will, as soon as primed, carry a water packing, that is, the pockets, slots and grooves in the cylinder will always be filled with water; only the excess or that taken in under the piston and measured by the capacity and the inner peripheral charged.

line of the casing: being disport, and also that the fullload is not thrown upon them until'after they have attained. the maximum of" .their outward throw. I find that this construction promotes the efficiency of the pump in the direction of preventing back throwof the buckets under full load and back slip of water past the outer orpperating edge of the bucket. The hollowing out of the back sides of the blades, as shown at 22 by creating a pocketed abutment directly across the path of the infiowing Water,

increases the effective pressure upon the blade from the inlet side of the pump as the blade takes up its full load, thus contributing to the prevention of back throw of the bucket, which, in pumps of this general type, I has hitherto proved a serious Tfault.

. In constructing the curved walls of the casing, the ends of-the several different arcs should be joinedion as nearly continuous lines as practicable, so that the bucket blades, in moving outwardly and inwardly, will travel evenly and smoothly, passing from one area to the nextwith a minimum of variation from a uniform swinging movement. I

-I claim:

.1. In a rotary pump,.a pump casing formed with parallel side walls and a cylindrical wall having arcs of different degrees of curvature, said casing having an inletport located some distance beyond one end of the are of smallestradius, and a discharge-port on the opposite side of the cylindrical wall therefrom the orifice of which overlaps the other end'of the are of smallest radius, in combl nation with a rotary bucket-carrier mounteddn said casing concentric with the arc of. smallest radius, and a series of buckets mounted iir pocketsformed in the periphery of of the space between the peripheral line of the piston outward throw before reaching the area of the inletsaid bucket-carrier and having radially swinging blades l ing inlet and outlet ports on opposite side's thereof, in com adapted to engage the inner surface of the cylindrical wall of the casing under centrifugal action, substantially as described.

2. In a rotary pump, apump .Ecasing formed with parallel side walls and a cylindrical wall, the latter having top and bottom portions formed on arcs of greater and less degrees of curvature, respectively, and side portions formed on arcs of intermediate degrees of curvature, said casing havinginlet and discharge ports on opposite sides of its cylindrical wall, the lower margins of which overlap the ends of said are of less curvature, in combination with a rotary bucket-carrier mounted ln said casing concentric with the center of said arc of greater curvature, and a series of buckets mounted in pockets formed in the periphery ot said bucket-carrier and having radially swinging blades adapted to engage the inner surface of the cylindrical wall of the casing under centrifugal action, substantially as described.

3. In a rotary p u'np a pump casing formed with parallel side wallsland a cylindrical wall, the latter having top and bottom portions formed on arcs of greater and less degrees of curvature, respectively, and side-portions formed on arcs of intermediate degrees of curvature, said casing having an inlet-port the upper edge of whose orifice is located some distance beyond one end of said arc of greater curvature while its lower end overlaps the arc of less curvature, and a dis'chargepor't whose lower end overlaps the other end of said are of-less curvature while its upper end overlaps the other end of said are of greater curvature, in -combination with a rotary bucketrcarrier mounted in said casing concentric with the center of said arc of greater curvature, and a series of -b'uckets mounted in pockets formed in the periphery of said bucket-carrier and having radially swinging blades adapted to engage the inner surface of the cylindrical walioi. the casing under centrifugal action, substantially as described.

4. In a rotary pump, a pump casing-formed with parallel side walls and an intermediate cylindrical wall having inlet and outlet ports on opposite sides thereof, in com-- bination with a rotary bucket-carrier mounted in said casing eccentrically thereof, the periphery whereof'is formed I with pockets for the buckets and curved radial slots communicating with one endof said pockets, respectively, and a series of'rocking buckets'carried. in said pockets and having curved blades reciprocably mounted in said slots, the

outer edges whereof are adapted to engage the inner surface of the cylindrical wall of -the casing under centrifugal action, substantially as described.

5. In a rotary pump, a pump casing formed with parallel side walls and an intermediate cylindrical wall havricr being formed bination with a rotary bucket-carrier mounted in said casing eccentrically tlilerrkiof, the peripheryof said bucket-carh pockets for the buckets and curved radial slots communicating with one end of said pockets, respectively, and either orboth sides. of said bucket-carrier being formed with an annular by-pass connecting the inner ends of said slots, and a series of rocking buckets carried in said pocket and having" curved blades reciprocably mounted in said slots, the outer edges whereof are adapted to engage the inner surface of the cylindrical wall of the casing under centrifugal action, substantially as described.

6. In a rotary pump, a pump casing formed with parallel side walls and an intermediate cylindrical wall having inlet and outlet ports on opposite sides thereof,-in combination with a rotary bucket-carrier mounted in said casing eccentrically thereof, the periphery whereof is formed with bucket-receiving pockets, and a series of rocking buckets carried in said pockets and having radially swinging blades, the rear sides of which are recessed to augment the pressure effect of the water thercagainst and aid ceptrifugal action in maintaining the outer edges of. said blades in sliding contact with the inner surface of the cylindrical wall of the casing during the travel of said l. A piston-bucket for use in rotary pumps consisting of a blade, a bearing member, and one or more arms narrowerthroughcut than the blade connecting the latter adjacent to its operating edge with said bearing member, substantially as described.

8. A piston-bucket for use in rotary pumps consisting of a blade having a beveled operating edge adapted to afford a substantially line contact with the wall of the pump cylinder, a bearing member, and one or more arms narrower throughout than the blade connecting the latter adjacent to its beveled edge with said bearing member, substan tiaily as described.

9. A piston-bucket for use in rotary pumps havinga blade formed with arecess on its rear side, substantially as and for the purpose described.

10. A piston-bucket for use in rotary pumps consisting of a blade having a beveled operating edge adapted to atford a substantially line contact with the wallof a pump cylinder and also having a recess on its rear side, a hearing member, and one or more arms connecting the latter with said hearing member, substantially as described.

' ROBER" M. BLACKMER.

Witnesses: 1

SAMUEL N. Pom), llnnonmex C. Goonwm. 

